Re: [PATCH 3/5 v4] accel/qaic: Add consistent integer overflow checks

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On 7/14/2023 5:44 AM, Pranjal Ramajor Asha Kanojiya wrote:


On 7/11/2023 1:51 PM, Dan Carpenter wrote:
The encode_dma() function has integer overflow checks.  The
encode_passthrough(), encode_activate() and encode_status() functions
did not.  I added integer overflow checking everywhere.  I also
updated the integer overflow checking in encode_dma() to use size_add()
so everything is consistent.

Fixes: 129776ac2e38 ("accel/qaic: Add control path")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
v2: no change

  drivers/accel/qaic/qaic_control.c | 14 ++++++--------
  1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/accel/qaic/qaic_control.c b/drivers/accel/qaic/qaic_control.c
index 752b67aff777..23680f5f1902 100644
--- a/drivers/accel/qaic/qaic_control.c
+++ b/drivers/accel/qaic/qaic_control.c
@@ -367,7 +367,7 @@ static int encode_passthrough(struct qaic_device *qdev, void *trans, struct wrap
      if (in_trans->hdr.len % 8 != 0)
          return -EINVAL;
-    if (msg_hdr_len + in_trans->hdr.len > QAIC_MANAGE_EXT_MSG_LENGTH)
+    if (size_add(msg_hdr_len, in_trans->hdr.len) > QAIC_MANAGE_EXT_MSG_LENGTH)
          return -ENOSPC;
      trans_wrapper = add_wrapper(wrappers,
@@ -558,12 +558,10 @@ static int encode_dma(struct qaic_device *qdev, void *trans, struct wrapper_list
      msg = &wrapper->msg;
      msg_hdr_len = le32_to_cpu(msg->hdr.len);
-    if (msg_hdr_len > (UINT_MAX - QAIC_MANAGE_EXT_MSG_LENGTH))
-        return -EINVAL;
-
      /* There should be enough space to hold at least one ASP entry. */
-    if (msg_hdr_len + sizeof(*out_trans) + sizeof(struct wire_addr_size_pair) >
-        QAIC_MANAGE_EXT_MSG_LENGTH)
+    if (size_add(msg_hdr_len,
+             sizeof(*out_trans) + sizeof(struct wire_addr_size_pair)) >

Can we have the entire size_add() on same line?

+             QAIC_MANAGE_EXT_MSG_LENGTH)
          return -ENOMEM;
      if (in_trans->addr + in_trans->size < in_trans->addr || !in_trans->size) @@ -635,7 +633,7 @@ static int encode_activate(struct qaic_device *qdev, void *trans, struct wrapper
      msg = &wrapper->msg;
      msg_hdr_len = le32_to_cpu(msg->hdr.len);
-    if (msg_hdr_len + sizeof(*out_trans) > QAIC_MANAGE_MAX_MSG_LENGTH)
+    if (size_add(msg_hdr_len, sizeof(*out_trans)) > QAIC_MANAGE_MAX_MSG_LENGTH)
          return -ENOSPC;
      if (!in_trans->queue_size)
@@ -719,7 +717,7 @@ static int encode_status(struct qaic_device *qdev, void *trans, struct wrapper_l
      msg = &wrapper->msg;
      msg_hdr_len = le32_to_cpu(msg->hdr.len);
-    if (msg_hdr_len + in_trans->hdr.len > QAIC_MANAGE_MAX_MSG_LENGTH)
+    if (size_add(msg_hdr_len, in_trans->hdr.len) > QAIC_MANAGE_MAX_MSG_LENGTH)
          return -ENOSPC;
      trans_wrapper = add_wrapper(wrappers, sizeof(*trans_wrapper));

Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@xxxxxxxxxxx>

Pushed to drm-misc-fixes

-Jeff



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